Some utilities are fighting back against the growth of rooftop solar by imposing fees and changing rate structures. Arizona is just one example of a state where those battles are being fought. But now some Colorado lawmakers are hoping to head off potential similar tactics for energy storage.

The bill introduced by state senators Fenberg and Lundberg would apply to storage systems greater than 25 kW and limit the ability of utilities to set fees and charges that discriminate against customers who install storage systems.

“Colorado consumers should have the ability to install batteries that could not only lower their utility bill every month but also serve as a backup if the power were to go out,” Senator Fenberg said in a statement. “The use of electrical storage systems is not just cost-saving for the consumer, but it helps reduce costs for all of Colorado’s ratepayers.”